Waterproof composition and process of producing same



106. COMPOSITIONS,

COATING OR PLASTIC.

Patented May 22, 1934 UNITED STATES PATENT OFFICE WATERPROOF COMPOSITIONAND PROCESS OF PRODUCING SAME combine a is added thereto.

Lester Kirschbraun, Leonia, N. J., assignor, by mesne assignments, toThe Patent and Licensi r 1 ing Corporation, New York, N. Y., acorporaits, -c-" tion of Massachusetts he a No Drawing. Application July19, 1929, Serial No. 379,579

2 Claims. (0]. 134-1) This application is a continuation in part of mycopending application Serial No. 178,147 filed March 24th, 1927.

This invention relates to the production of waterproof compoundssuitable for use in vario'iis apaci ies. ore par icularly, the presentinvention has for one of its objects, the production of a compound inthe nature of an asphalt plastic in which the wear-resisting propertiesof asphalt are increased without sacrificing any of the waterproofingqualities thereof.

Another object of the invention resides in the production of a compoundof this character which can be applied by means of a brush or spray inmuch the same manner as paint or similar coatings are applied, and whichwhen dry will form a tough waterproof coating possessing certain otheradvantages hereinafter to be pointed out.

In accordance with the present invention, I

dispersion gffiituminous substance with h drau 1c cement. e. In carryingout the inventio% I first prepare a dispersion of the characterindicated by liquefying by means of heat an asphalt of say 100 to 190degrees F.

melting point, and introduce this molten asphalt into an emulsifyingapparatus simultaneously ,with the introduction thereto of a is rs mwhich preferably takes the form of an The agitating means whereby thebinder and the aqueous mixture may be thoroughly mixed to efiectdispersion of the asphaltic material in the aqueous suspension.

The foregoing brief description of the manner of producing thedispersion represents a continuous type of operation. It should beunderstood however, that the bituminous material may be dispersed in abatch process by introducing molten asphalt into the aqueous suspensionof the clay-like material, the whole mass being constantly agitated asthe asphalt The dispersion as produced K by either type ofoperatio'rfshould comprise %-65% of asphalt the remainder of thedispersion being heaqueous vehicle and dispersive media.

it should be understood that while the fore; going description hasreference to asphalt as e the bituminous material dispersed, and to claymaterial dispersed and the dispersive media are other than thosespecified. Thus, the dispersing media may comprise colloidal oxides,powdered metallic hydroxides and silicates, casein, organic andinorganic paste-forming powders, and the w c 0 no ,R,.Y9,-. ....9, .'9hdraulic ceme'r' ti orwhich are not broken by the electrolyte 'in thecement. The material dispersed may include gsphalLeither of the naturalor artificial variety, vegetable or animal itches, resins. or fluxedmixtures of these materials with oils 0 a rocarbon nature. e se ecion 0e particular bituminous material to be dispersed, and the dispersingmedia, are generally governed by the availability of the particularmaterial, although the final dispersion should satisfy the requirementthat it be of sufliciently stable character or capable of beingstabilized to permit the incorporation therewith of substantialquantities of the hydraulic cement.

It will be found that dispersions produced by either of the modes hereindescribed, and using material such as those specified, will becharacterized by that degree of stability which willf enableincorporation of substantial quantities of 5 a cementitious materialsuch as Portland cement without affecting the stability of t edispersion. The plastic thus produced by the admixture of thecementitious material with the dispersion, can be applied while in acold state, and when permitted to dry will give rise to a product havingsubstantial toughness, rendering the same highly useful in various arts.

The preferred method of preparing the com- 2 position is to make up arelatively thick sl u i y of Portland cement with water and then mix r 1e ducing the dispersion into the slurry, imm ate y DIlOI, Jfi'e'. V j I"I IN I O f of cement not thoroughly broken down and disintegrated sothat the slurry will have the consistency of a smooth cream. Thepresence of powdery lumps in the slurry is objectionable for the reasonthat these lumps will, upon subsequent drying of the composition, appearin the final film. The quantity of Portland cement which may becompounded with the dispersion will vary in accordance with the use towhich the product is applied, from proportions of say 4 to 7 parts ofemulsion by volume to 1 part by volume of dry cement, the largerproportions of cement "givin'g'greater toughness. be observed, however,that quantities in excess It should of those compatible with theproduction of a plastic non-rigid film are to be avoided.

In one mode of carrying out the present invention with 120 degrees F.penetration asphalt for example, I prefer to use about 20% of Port: landcement on the basis of weight of th'edis: When a layer of sufiicientthickness for the depErsion used. This proportion is however, illussired purpose has been built up or otherwise aptrative and is not to beregarded, in any sense, plied, sufiicient time is allowed for theevaporalimiting. The object to be had in mind in any tion of thatportion of the water which does case, however, is to have sufficientbinder presnot enter into combination with the hydraulic ent in thewater-free film so that the latter cement, with the result that thePortland cepossesses the elasticity and toughness of a bitument-asphaltmixture will dry to a tough and minous composition rather than thecharactersomewhat resilient coating. This coating is furistic rigidityof a hydraulic cement composition. ther characterized by the alkalinenature im- The best explanation of the causes which give parted theretoby the lime and other alkaline rise to the peculiar toughness of thewater-free constituents of the cement, and this feature film that cannow be given may not be entirely may be taken advantage of in one use towhich accurate, but it seems that this toughness may the product of thepresent invention may be be attributed to the fact that the Portlandput, namely in the coating of pipes or similar cement occupies theinterstitial spaces between surfaces where it is desirable, oressential, that the asphalt particles, and as the water evapothe surfacepossess rust inhibitiye as well as rates and combines after application,this ce waterproofing qualitie s. It will be found that mentconcentrates into the interstitial spaces marked rust-inhibitiveproperties will be imforming film-like coverings about the particlesparted to the surface by virtue of the alkaline so as to produce ineifect a honey-comb struocharacter of the product due to the presence oftyre. This structure upon setting rnust not con; the lime constituentsin the cement. When aptflill Ellfllcient cement to Prevent Permeationplied to steel surfaces, this rust-inhibiting propqoalescence of asphaltparticles throughthe neterty appears to be well defined when thehydrowork of cement, but should have present quangen ion concentrationis at a value above 9.0, t t e s ufi c to y the ydraulic action andhence where the pH of the product is below thereof, t the Structural t hss Of the fi a this value, it may, in some instances, be desirp o u Ifto mu h cement or o litt e disable to bring the hydrogen ionconcentration to persion is present in the composition, the prodsuchvalue by the addition of alkali, in order to uct has the properties of acement structure, provide the maximum rust inhibitive characterthat isrig and without pla i y, although istics. Generally, however, when atleast 20% Waterproof to $01118 degree S c a composition of the cement iscombined with the emulsion this and Proportions giving e to are to beadjustment of the pH will not be necessary, and avoided in accordancewith the present inventhe coating itself will provide sufficientalkalintion. ity to impart well marked rust-inhibitive char- The productis further characterized by its actel'lstlcs, great ability to resistflow under heat at tem- The product of the present invention isparperatures substantially above the melting point ticularly suitablefor coating pipes buried unof the bitumen used. Likewise the tendencyderground, since the toughness due to the Portfor the cement to come tothe surface of the land cement serves to increase the wear-resistappliedfilm results in a structure having a noning qualities of the otherwisesoft coating and tacky surface, of a dark gray color, and possessenableit more securely to withstand abrasion ing great superficial toughness,and yet sufficiegiqid the weight of the material below which it is meansof a brush or a spray, in a manner sim1- lar to the application of acoating of paint. The material is sufficiently fiuid, or can be made soby the addition of water, to permit its being spread or built up to anydesired thickness.

adhesiveness to provide a proper bond betwee imbedded. the film and thesurface to which it is applied. I claim as my invention: This conditiongives the effect when the film is 1. A waterproofing compositionconsisting of dry, of a tough rind on the more plastic underan aqueousdispersion of bituminous material base or sub-surface material. admixed;with" hydraulic cement, the character It will be seen that by virtue ofadopting such and proportion of said cement being such as toproportions, a relatively thick film can be mainrender the compositioncapable of setting, upon tained as a protective structure in which theapplication, to a tough, non-rigid plastic film, desirable properties oflow melting point asphalt the proportion of said cement being between orcoal tar can be employed while at the same and the amount of dispersionby volume. time maintaining the necessary dryness of sur- 2. Awaterproofing composition consisting of face, resistance to flow underheat, and toughan aqueous clay-type dispersion of bituminous nesssufficient to withstand mechanical injury. material admixed withPortland cement, the The compound prepared as hereinabove decharacterand proportion of said cement being scribed may be applied in theformofa coating such as to render the composition capable of to any surfacewhichitis desired to waterprooisetting, upon application, to a tough,non-rigid While the material may be applied in various plastic film, theproportion of said cement being ways to form the coating, it is one ofthe feabetween and the amount of dispersion by tures of the presentinvention that the comvolume.

pound lends itself very readily to application by LESTER KIRSCHBRAUN.

